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钢筋混凝土板梁(RCS)桥的荷载效率很大程度取决于板的活载弯矩。当采用AASHTO近似计算法评估RCS桥的荷载效率时,发现许多RCS桥的荷载效率相对较小,因此需采用更高水平的评估技术来确定更准确的等效板宽。以某RCS连续板梁桥为背景,首先利用AASHTO荷载和抗力效率系数评估该桥的荷载效率,然后进行荷载试验,测量板的活载应变。结果表明,钢筋混凝土板的刚度与开裂的总截面特性一致。在试验基础上建立有限元模型,从有限元分析得到的混凝土板的弯矩与使用开裂的总截面弹性模量平均值计算的试验弯矩吻合较好。精细分析得出的等效板宽大于通过AASHTO近似计算确定的等效板宽。等效板宽的增加降低了活载作用效应,同时也使效率系数成比例地增加。
The load efficiency of reinforced concrete slab (RCS) bridges depends very much on the live load bending moment of the slab. When using the AASHTO approximation method to evaluate the RCS bridge load efficiency, many RCS bridges were found to be relatively inefficient and therefore require a higher level of assessment to determine a more accurate equivalent width. Taking a RCS continuous girder bridge as the background, the load efficiency of the bridge was first evaluated by AASHTO load and resistance efficiency coefficient, and then the load test was carried out to measure the live load of the plate. The results show that the stiffness of the reinforced concrete slab is consistent with the total cross-sectional characteristics of the cracking. The finite element model was established on the basis of the experiment. The bending moment of the concrete slab obtained from the finite element analysis was in good agreement with the test bending moment calculated from the average value of the total cross-section elastic modulus of cracking. The equivalent plate width obtained by the detailed analysis is larger than the equivalent plate width determined by the AASHTO approximation calculation. An increase in equivalent plate width reduces the live load effect while also increasing the efficiency factor proportionately.